Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75dffbc9470ca89…

MALICIOUS

PDF

78.1 KB Created: 2021-07-08 08:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99df57cdfd2c18b5319deee0e41a8457 SHA-1: 1707c2c57dad1c9e4a2dfa563a5595968f79a291 SHA-256: c75dffbc9470ca8914a9c38f92368dd6bac39ec3b79827dd29cc69700cf55e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.look4job.gr/images/_user_na/file/riked.pdf
    • http://gourmethousemacau.com/UploadFilesfile///tezefubebajakutelag.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ei1k2dsuq16erdfi8bd2m65ur0/26097406121.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/bafavalevig.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f003eeb2---jukad.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dco1egie00vaj5d192gnt2lmsu/54460978154.pdf
    • http://ekopaczka.pl/imgbrama/files/61715949671.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/82788270986.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ijmcgollpr26vs2trddcoqnsd4/71699615934.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/hpcnf5sj8cbq9o1dv14ga32esv/vogopumoregobuja.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/fujofikigotiraz.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56a29a475---wiradipapolujorulunedoz.pdf
    • https://autoskola-scp.com/files/xipijozulozazupinimanus.pdf
    • https://soosekszer.hu/upload/files/50431166221.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d52defed23093e1d604a6aff81dccb15/49076682488.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4ece8e2bbae852ea6357c577d3e89844/xowulixusap.pdf
    • http://turatabor.hu/media/48773668083.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48dff080c1---97150094468.pdf
    • http://fsgpj.com/upfolder/e/files/20210701191659.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/df509b2cd07831ab4e553936ab78fea2/34145768734.pdf
    • http://fipjp.com/userfiles/file/86371724808.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf4146228---27622663484.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ffxiv+leatherworking+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4e.bin
8715cb1b780c920ec69471c09d35924cf6299a96dc0eb3bca19a64d12d081a85
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 17548 bytes
font_01_sfnt_off0000fa47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16792 bytes
font_02_sfnt_off0001125e.bin
cf4bdb19a461f53829e2e80234554d1f2528d1852cf8228dffdc5152d4c03450
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 10888 bytes